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unicode: refactor the rule for regenerating utf8data.h scripts/mkutf8data is used only when regenerating utf8data.h, which never happens in the normal kernel build. However, it is irrespectively built if CONFIG_UNICODE is enabled. Moreover, there is no good reason for it to reside in the scripts/ directory since it is only used in fs/unicode/. Hence, move it from scripts/ to fs/unicode/. In some cases, we bypass build artifacts in the normal build. The conventional way to do so is to surround the code with ifdef REGENERATE_. For example, - 7373f4f83c71 ("kbuild: add implicit rules for parser generation") - 6aaf49b495b4 ("crypto: arm,arm64 - Fix random regeneration of S_shipped") I rewrote the rule in a more kbuild'ish style. In the normal build, utf8data.h is just shipped from the check-in file. $ make [ snip ] SHIPPED fs/unicode/utf8data.h CC fs/unicode/utf8-norm.o CC fs/unicode/utf8-core.o CC fs/unicode/utf8-selftest.o AR fs/unicode/built-in.a If you want to generate utf8data.h based on UCD, put .txt files into fs/unicode/, then pass REGENERATE_UTF8DATA=1 from the command line. The mkutf8data tool will be automatically compiled to generate the utf8data.h from the *.txt files. $ make REGENERATE_UTF8DATA=1 [ snip ] HOSTCC fs/unicode/mkutf8data GEN fs/unicode/utf8data.h CC fs/unicode/utf8-norm.o CC fs/unicode/utf8-core.o CC fs/unicode/utf8-selftest.o AR fs/unicode/built-in.a I renamed the check-in utf8data.h to utf8data.h_shipped so that this will work for the out-of-tree build. You can update it based on the latest UCD like this: $ make REGENERATE_UTF8DATA=1 fs/unicode/ $ cp fs/unicode/utf8data.h fs/unicode/utf8data.h_shipped Also, I added entries to .gitignore and dontdiff. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> 2019-04-28 20:45:36 +03:00			`mkutf8data`
			`utf8data.h`